Renogy 3000 watt inverter

[Mountainbiker]

I have 300 amp hours of lithium super b batteries and 175 watt solar. I’m thinking of getting a Renogy 3000 watt inverter - do any boffins out there know if that will be enough of a system to run my Truma Aventa comfort air con off grid? Also will it be possible to wire it in so all my sockets work when not on hook-up?

 

[herald_400rl]

Truma Aventa draws 2.8a at 230v when cooling, 644 watts, or 53ah ish at 12v. So max 6 hours on battery alone. Assume you get 175w for 4 hours a day that gets you 700w back in (call it an hour of aircon use).
Regarding the sockets, I've seen it has been done, presumably taking the wires from the normal 230v and starting them at the inverter.

 

[Odd-no-more]

I have 300 amp hours of lithium super b batteries and 175 watt solar. I’m thinking of getting a Renogy 3000 watt inverter - do any boffins out there know if that will be enough of a system to run my Truma Aventa comfort air con off grid? Also will it be possible to wire it in so all my sockets work when not on hook-up?

I have a renogy inverter and I have wired all the sockets through it, the only downside is it is all through a 13 amp plug so we have to be careful running the microwave and coffee machine at the same time even on EHU.

 

[Derbyshire wanderer]

Auto changeover relay for inverter

First picture is a selection of relays from RS components. The one on the right is my choice as it is 10 amp rated through the normally closed contact set which will be used for the inverter when off hook up. The normally open contact set is 30 amp rated and will be used to power a skt/skts as...

www.motorhomefun.co.uk

This thread gives you all the details needed for running the sockets from your inverter. Techno knew his stuff RIP

 

[MisterB]

We have 300ah Fogstar coupled with a 3kw Renogy inverter. We don't have air con but we can easily run a kettle, a microwave at the same time (so around 2.2 KW) and plenty of spare for other bits and bobs.
There are two plug type outlets on the inverter and I have used one to feed the kettle socket, water heater and spare socket. The other socket feeds just the microwave but will eventually feed an external socket for outdoor cooking.
The major benefit to me is that the inverter (and I know some other inverters do aswell) has that the pass through facility allows those sockets to become live when on EHU.

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[cyberyacht]

You'll need at a minimum 4 or 5 times as much solar to even think about aircon.

 

[autorouter]

It wouldn't run for very long. 300Ah of 12V battery can give you 300 x 12 = 3600Wh of energy, The Truma Aventa Comfort a/c uses 4.2A at 230V when cooling, which is 4.2 x 230 = 996W. So it would only run for 3600 / 996 = 3.6 hours, and then the battery would be 100% flat.

You can do other calculations, like taking into account the cooling cycles on and off when it's down to temperature, but the upshot is that it won't last very long. your 175W solar would give you about 70Ah per day, which as you can see will not make much of a contribution to the mix.

Since the Truma Aventa uses about 1000W of power while cooling, a 3000W inverter will easily cope with it, and you could probably get away with a 2000W inverter. However the batteries will not be able to keep up with that sort of demand, which is constant and sustained.

 

[MisterB]

I think autorouter sums it up perfectly in terms of the battery. Yes I use a kettle etc BUT it's not on continually whereas an air con is. I would however still recommend the 3kw inverter ....

 

[stevewagner]

The Renogy inverter has a built in automatic changeover switch so very easy to connect to your consumer unit.