I am designing a backup system for a gate (240V, 3/4 HP motor) in an extreme climate of -10°F (-23°C). I will use a MultiPlus-II 48/3000 and two Victron LiFePO4 25.6V/200Ah Smart batteries. Since the manual prohibits charging below 5°C, I plan to install an 80W heater controlled by the Cerbo GX rel…

We build our battery heaters using small silicon pads encapsulated in sheet metal. There’s a little more to it, but that’s the gist. This helps to distribute the heat from the pads across the bottom of the battery. A 20W silicone heating pad can deform or melt the plastic case if you just stick the …

I solved the heating of the LFP this way; [image] Heating system to keep LFP core temperature above 5C at all times DIY My camper is stored during wintertime in an unheated glasshouse. 230V is supplied during 1,5hrs/day. Once the temperature of the LFP sinks…

[image] Erik: Does Victron consider 80W to be an adequate and safe load to maintain the thermal mass of these batteries in that temperature range without compromising the integrity of the battery casing? This has nothing to do with the battery’s specific heat capacity (“thermal mass”), but so…

I used an AI to size the heating system. One of the crucial considerations is the heatflux W/dm2 through the battery casing. I think the lower, the better. It avoids thermal stresses in the casing but also in the interior of the LFP

[image] Remy1: I used an AI to size the heating system. I would never trust an AI for that. Calculating the heat loss itself is a trivial matter that requires only elementary arithmetic. Don’t give control of your life to an AI. [image] Remy1: heatflux W/dm2 through the battery casing. …

To me, the main advantage of an AI is that it searches the web for components much faster than I ever could. Always use more than one. I keep on monitoring the coretemperatur of the LFP and the temperature measured at the +. How the difference between the two develops is a measure of how quick t…

[image] Remy1: To me, the main advantage of an AI is that it searches the web for components much faster than I ever could. Always use more than one. Current AI does nothing more than search the web. And because there’s so much utter rubbish on the web, AI contributes to the further spread a…

I designed a battery room for someone in Sweden, en they do not need any heating. The U factor of the shell is 0.1385 and that of the batteries another 0.45 and because of that the discharge en charging takes care of the heating. Yes. It can get pretty hot. Got word the other day that they ran into…

I do not understand the focus on the insulation? This is not the key topic. Key is not to put too much heat into the sidewalls which will damage the LFP but also not too little in order to have enough to warm up the interior. Heatloss is secundary. Heatloss can be compensated for by keeping the…

[image] Remy1: I do not understand the focus on the insulation? This is not the key topic. Oh yes, this is the key topic: [image] Erik: Technical question: Does Victron consider 80W to be an adequate and safe load to maintain the thermal mass of these batteries in that temperature range…

Power required for battery heating

DIY

Remy1 February 18, 2026, 8:16am 3

I solved the heating of the LFP this way;

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Power required for battery heating

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