Schaudt and b2b (3 Viewers)

[3crispies]

Finally getting to need a b2b, before I take everything to pieces what is the white piece of kit behind ebl252.
Was hoping to add a 2nd leisure battery but on previous post seems it will be an expensive option as need to uprated charging capabilities.

 

[f6c]

Lenny HB is your man

 

[Lenny HB]

Your 3rd photo is a Schaudt B2B, I wouldn't recommend them for Lithium as they charge at a cost 14. 2v and don't shut off or go to a float voltage on the Lithium setting.

 

[LostInSpace]

I am not so sure that is major problem as we never have the engine running long enough, at one time.

The Hymer fitted Schaudt 121545 works very well on our Exsis-i - charging at 45 amps.

Certainly with our Sterling Power batteries; well within the documented tolerences.

 

[Gerry77]

Finally getting to need a b2b, before I take everything to pieces what is the white piece of kit behind ebl252.
Was hoping to add a 2nd leisure battery but on previous post seems it will be an expensive option as need to uprated charging capabilities.



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Where are these all located in your Exsis as I have just bought an Exsis 504 and haven’t yet searched for anything other than the EBL?

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[Ian_H]

Edit:I think Lenny HB meant constant 14.4V in his post above.
I have our Schaudt 121525 on the gel setting, which drops down to 13.8V (iirc).But my lithium is mainly charged with solar and I have a manual switch in the d+ to the b2b which is switched off most of the time.

 

[G1969]

Your 3rd photo is a Schaudt B2B, I wouldn't recommend them for Lithium as they charge at a cost 14. 2v and don't shut off or go to a float voltage on the Lithium setting.

When offgrid PS fitted my Victron/ lithium upgrade they left the Schaudt in, so get 75amps (25 +50) when driving. In your opinion will this be detrimental to the longevity of the batteries then?

 

[LostInSpace]

Where are these all located in your Exsis as I have just bought an Exsis 504 and haven’t yet searched for anything other than the EBL?

The B2B in our new Hymer Exsis-i 580 is located under an access hatch in the floor (under the table).

When offgrid PS fitted my Victron/ lithium upgrade they left the Schaudt in, so get 75amps (25 +50) when driving. In your opinion will this be detrimental to the longevity of the batteries then?

Very unlikely, but depends on how much LiFePO4 they fitted.

 

[berni109]

I am sure RogerIvy would not have left you original B2B in place if it was going to cause you any problem.

 

[Lenny HB]

I replaced my Schaudt B2B with a Victron XS, spending all that money on Lithium I didn't see the point of leaving B2B that doesn't have the ideal charging profile for Lithium.

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[LostInSpace]

I replaced my Schaudt B2B with a Victron XS, spending all that money on Lithium I didn't see the point of leaving B2B that doesn't have the ideal charging profile for Lithium.

A valid option. But, I already had the Sterling Power lithium from the last van and they been on such a profile for years.

 

[G1969]

The B2B in our new Hymer Exsis-i 580 is located under an access hatch in the floor (under the table).


Very unlikely, but depends on how much LiFePO4 they fitted.

I have 2x 280ah Fogstar

 

[StillGoing]

Finally getting to need a b2b, before I take everything to pieces what is the white piece of kit behind ebl252.
Was hoping to add a 2nd leisure battery but on previous post seems it will be an expensive option as need to uprated charging capabilities.


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The white box in the second and third pictures looks like it could be a protective cover for the wiring.

 

[LostInSpace]

I have 2x 280ah Fogstar

70 amps will be no problem.

 

[potwalloper]

When offgrid PS fitted my Victron/ lithium upgrade they left the Schaudt in, so get 75amps (25 +50) when driving. In your opinion will this be detrimental to the longevity of the batteries then?

I have the Schaudt 25A B2B in parallel with the new 50A Orion XS feeding a Fogstar 280Ah. Works brilliantly. The Orion puts out a full 50A, but the Schaudt only adds about 13A, giving me about 63A charging. Offgrid PS Roger suggested that the Schaudt is 'adaptive charging' thus limiting its own output.

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[MichaelT]

I have the Schaudt 25A B2B in parallel with the new 50A Orion XS feeding a Fogstar 280Ah. Works brilliantly. The Orion puts out a full 50A, but the Schaudt only adds about 13A, giving me about 63A charging. Offgrid PS Roger suggested that the Schaudt is 'adaptive charging' thus limiting its own output.

Ours the same but we have 500a of batteries. Not driven long enough to use the B2B much so far.

 

[LostInSpace]

We get the full 45 amps from our Schaudt WA 121545.

 

[3crispies]

Your 3rd photo is a Schaudt B2B, I wouldn't recommend them for Lithium as they charge at a cost 14. 2v and don't shut off or go to a float voltage on the Lithium setting.

ignore my ignorance, the B2b works only on engine running ? need the easiest option to connect something like a vanbitz battery master. Last year we used motorhome regularly but recently always working. Had to leave van running as starter battery dropped lower than I would like.

 

[3crispies]

Where are these all located in your Exsis as I have just bought an Exsis 504 and haven’t yet searched for anything other than the EBL?

sorry ours is a weinsberg so have no idea.

 

[3crispies]

The white box in the second and third pictures looks like it could be a protective cover for the wiring.

possibly, cant access rear screws to remove. So can not get at 12v connections on rear of Ebl.

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[RogerIvy]

I am sure RogerIvy would not have left you original B2B in place if it was going to cause you any problem.

Just got back from Lincoln show … so a quick answer before some rest!

We’ve done a fair amount of testing the combination of the Schaudt booster and a Victron DC-DC, and so far not seen any negatives. In theory you’d think that when you combine 50A and 25A you’d get 75A, but in reality the booster reduces its output by around 5-10A, so you squally get somewhere around 65A.

Our preference of DC-DC chargers is clearly a Victron XS these days, but that doesn’t mean I have an adverse opinion of the “booster” (other than the strange naming convention). Schaudt do make good kit and their support has always been good with us, on the whole the booster is highly regarded out there.

Back to the combination. Our thinking was: if the two chargers can coexist, is this a way to get the battery charged a bit faster, or at least to leave the booster in place to compensate for what the absorption fridge would use (and yes I know that you can change the wiring to run the fridge off a different circuit). We’d not do this with a 105ah because 50A is the max you’d go to with most 105ah batteries. The 230-560ah range can all be charged at 100A or more, and the output from a combination of the DC-DC’s and the solar controllers would practically never exceed 100A.

The different charge profiles (Victron and Schaudt) don’t appear to be a problem. It’s crazy that arguments for or against float charging LiFePO4 are still in the air (the usual answer is “it depends”). There are many opinions and theories but very little data to support them.