Renogy 40amp B2B

[Itsmcb]

Anyone using one of these? Are you happy with it, is it noisy or does it get hot? I'm thinking of getting one whilst they are on offer on Amazon (£99)
Feedback gratefully received

 

[zaskar]

If you dont mind me asking, why would anyone need a 40amp B2B. Seems massive to my uneducated mind. Not having a pop, just curious?

 

[Jev88]

Renogy - good advertising across platforms but don't have a UK presence that I am aware of. Drop ship from Hong Kong or Singapore?
i.e. where can you go for tech support and returns?

 

[Driventemple]

I have the 20A version. It's not noisy, it only runs whilst you are driving!

 

[Jev88]

If you dont mind me asking, why would anyone need a 40amp B2B. Seems massive to my uneducated mind. Not having a pop, just curious?

LIPO can suck in a lot more charge per hour than a standard wet acid. The more you offer it, the faster it fills?

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[Itsmcb]

If you dont mind me asking, why would anyone need a 40amp B2B. Seems massive to my uneducated mind. Not having a pop, just curious?

The B2B is the next stage in my preparation for fitting lithium batteries. 40amps will recharge them quickly in the wintertime.

 

[Itsmcb]

Renogy - good advertising across platforms but don't have a UK presence that I am aware of. Drop ship from Hong Kong or Singapore?
i.e. where can you go for tech support and returns?

Good point but with Amazon no worries for a least 1 year.

 

[autorouter]

If you dont mind me asking, why would anyone need a 40amp B2B. Seems massive to my uneducated mind. Not having a pop, just curious?

Faster charging means it can fill up on a shorter drive. Using a 20A B2B, a 200Ah battery down to 20% requires 180Ah of charge, which would take 180/20 = 9 hours of driving. A 40A B2B will refill it in 4.5 hours. For my lithium batteries I have a 70A B2B, and for the bigger batteries a 140A B2B is often used.

 

[Lenny HB]

If you dont mind me asking, why would anyone need a 40amp B2B. Seems massive to my uneducated mind. Not having a pop, just curious?

40 amp is a small one, 60 amp are very common and you can get various sizes up to 120 amps or more.
Lithium batteries can be charged at up to 200 amps dependant on model.

 

[Jev88]

Good point but with Amazon no worries for a least 1 year.

Bimble Solar have a UK presence? I would be wary of Renogy under £100? Just sounds too cheap for 40A?
But then I guess that is why you are seeking other users here

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[Vansflyer]

Another factor to consider is unless you keep the split charge relay in circuit (not normally a good idea) the B2B will also be powering your fridge whilst driving. On ours this can be up to 15A so our 2 x 60A B2B only puts in 45ah to the lithium at times + whatever the solar is adding.

 

[dunnah01]

Don't forget to add as much again and more for wiring and connectors etc..

 

[Lenny HB]

Another factor to consider is unless you keep the split charge relay in circuit (not normally a good idea) the B2B will also be powering your fridge whilst driving.

Split charge relay & fridge relay are normally two seperate relays so that won't happen.

 

[Vansflyer]

Split charge relay & fridge relay are normally two seperate relays so that won't happen.

I agree but when I cut the link on our CBE unit our C-Tourer took the fridge power from the leisure battery directly. I have metered it and the readings confirm the fridge "on" 12V it pulls the charge down by a lot. Maybe just a CBE thing but most info is good info.

 

[Driventemple]

I don't have Lithium. Sorry Lenny HB the van came with twin AGM. So figgered 20A was enough. I have been able to monitor my power usage with a Raspberry Pi and Venos OS and gradually improve the system - solar, then B2B as I needed.

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[Lenny HB]

I agree but when I cut the link on our CBE unit our C-Tourer took the fridge power from the leisure battery directly. I have metered it and the readings confirm the fridge "on" 12V it pulls the charge down by a lot. Maybe just a CBE thing but most info is good info.

There is a another link on the CBE units that swaps the fridge power to the leisure battery maybe that is connected on your unit.
Pausim may have some info.

Elektroblock units have seperate relays.

 

[Itsmcb]

Bimble Solar have a UK presence? I would be wary of Renogy under £100? Just sounds too cheap for 40A?
But then I guess that is why you are seeking other users here

£160 on other websites but currently on special offer on Amazon

 

[Itsmcb]

Split charge relay & fridge relay are normally two seperate relays so that won't happen.

Yep, that's what I have.

 

[Kannon Fodda]

Size of alternator will also affect whether B2B, fridge and other stuff can work at their maximum.

 

[bigtree]

Size of alternator will also affect whether B2B, fridge and other stuff can work at their maximum.

How do you find out what size of alternator you have ?

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[Lenny HB]

How do you find out what size of alternator you have ?

Your E Line will have an uprated one 160 or 180 amp.
Part number on the alternator would confirm it.

 

[bigtree]

Your E Line will have an uprated one 160 or 180 amp.
Part number on the alternator would confirm it.

I’m still trying to find out how bits work, under the bonnet has not been investigated yet.
When are you available for a consultation call tomorrow ?

 

[Northernraider]

Yep I have this fitted in my euramobil .. works fine not noisy unless it's left running with engine stopped.

I'll probably fit one in my next van too

 

[Lenny HB]

I’m still trying to find out how bits work, under the bonnet has not been investigated yet.
When are you available for a consultation call tomorrow ?

Yep I'm around.

 

[Googlebot]

It’s a good price, some Amazon reviews say they didn’t last long though.

It’s worth a punt for £100.

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[stevewagner]

I bought a Renogy 60amp dc to dc charger in February and it failed about 6 weeks ago. Renogy were awful to deal with. No UK agent. Contacted them by email through the website and they never responded. Managed to talk to someone through their chat box and they had me jumping through hoops providing various meter readings, trying different combinations with my 3 leisure batteries. I knew it had failed as there was no voltage at the output terminals. They were using all sorts of delaying tactics hoping that I would go away. Finally got a refund but all in all a stressful experienc.

 

[MartinandBev]

Anyone using one of these? Are you happy with it, is it noisy or does it get hot? I'm thinking of getting one whilst they are on offer on Amazon (£99)
Feedback gratefully received
View attachment 774336

I’m using this exact model, changes very well, it’s silent and not noticed it getting hot at all, albeit I do have it near and air vent

for the price I’m well impressed and certainly better than the split charged that was factory installed

 

[Pausim]

There is a another link on the CBE units that swaps the fridge power to the leisure battery maybe that is connected on your unit.
Pausim may have some info.

Elektroblock units have seperate relays.

CBE provide a less comprehensive wiring diagram than Elektroblock but I can confirm that the CBE DS continues to power the 12V fridge function when the split charge relay is disabled. When the engine is running with the split charge operating normally the engine and leisure batteries are linked with the power for the fridge coming from higher voltage engine battery/alternator. If the relay is disabled the DS continues to get power from the leisure battery and the fridge relay is operated by the D+ signal (simulated by the DS). If you have a B2B the leisure battery gets a charge from this which in effect means the alternator is still providing power for the fridge.

One thing bigtree may need to bear in mind is that whatever the fridge consumes will come out of the B2B output. In my case from the 43A B2B output about 15A goes to the fridge and other functions leaving 28A to charge the leisure battery.

 

[Driventemple]

One thing bigtree may need to bear in mind is that whatever the fridge consumes will come out of the B2B output. In my case from the 43A B2B output about 15A goes to the fridge and other functions leaving 28A to charge the leisure battery.

I can confirm that. I snipped the resistor in my CBE unit and when tested, 17A was going into the battery with the electric fridge running. I was happy with that figure as before B2B fitting only 6 to 8A were going to the battery.
(20A B2B and AGM batteries)

 

[Vansflyer]

Another factor to consider is unless you keep the split charge relay in circuit (not normally a good idea) the B2B will also be powering your fridge whilst driving. On ours this can be up to 15A so our 2 x 60A B2B only puts in 45ah to the lithium at times + whatever the solar is adding.

Error on my part, we have 2 x 30A B2B not 2 x 60A. Sorry for the miss information but I had just driven back from Scotland so my brain was mashed. 45Ah into Lithium, max 15A for fridge or there abouts.