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Dominic.rose avatar image

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Hi, I am building a setup in my van and wanting to know if I can use power from my mppt when my battery is fully charged without using my battery.

For example, my idea is to have 12v electric underfloor heating in my van. If my battery is fully charged I want to power the heating but don't want it to deplete my battery.

Same theory to heat my water tank.

So when I come back to the van, I have a full battery and possibly hot water and a warm van. I have a diesel heater if it gets cold.

If possible, how do I wiring this?


Dom

MPPT - Solar Charge Controller
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2 Answers
Paul B avatar image

put a control relay in the turns on using a timer after say 1 or 2 hours of battery voltage at over 14 volts then also turn off if the voltage falls below 13 volts

this way the battery will be close to 90 to 100% and as long as you dont draw more amps than the solar can provide then you are fine.

as long as you stay above 13 volts you wont be drawing from your battery.


this is a very ruff way of doing it and the idea would need to be tested due to current draws as I have no other information about your setup

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Dominic.rose avatar image

Thanks for the reply, I currently have two LG 250watt panels

The victron blue smart 150-35 charger coming tomorrow. I'm pretty sure that's the one.

I only have a victron smart 12v 90amp hour lithium battery.

Besides that I have a victron cyrix-lt-ct to go to the 2005 iveco daily alternator.

That's all I have so far, not sure what I'll need.

Oh and the underfloor heating is 12v 150w 2m2 from prowarm.

Any advice would be greatly appreciated!


Kind regards

Dom

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