Also, at 1500W, the 5kW batteries wouldn't really be enough to run the heat all night (unless, maybe, there is good insulation or the temperature setting is low).Įven if not heating the van, the math applies to any 1500W appliance (microwave, toaster, etc). The BMS on a 12V system would need to handle that 125A draw, too (and the C rating on the batteries needs to be thought about). A 1500W electric heater will draw 125A at 12V from the battery (more really due to the inverter efficiency). Not sure about OP's situation, but consider heating the van. Victron Multiplus and seperate MPPT solar charger. My recommendation is to consider Victron products if budget allows. Whilst attractive there is a continious power consumption that needs to be taken Into account. Review the decision to use an 'all in one'. The fast recharge of lithium is a great advantage over LA. ĭo you really need 4800 watt hours of battery, unless you have high power use, like Induction cooking, many modest coversions get by with 2400 watt hours. Unless the inverter power exceeds 2000 watts a 12v system is more practical. I suggest 24 volt batteries, a 100 Ah is manageable weight wise, multiple 100Ah 24 volt batteries in parallel will alow easy expansion and redundancy. A further issue with the two battery series setup, is that the two BMS operate independently and are not synchronised, perhaps leading to more issues. With a 24volt battery a single BMS is looking after all 8 cells in the series battery thus there is no problem. You do you.Ī problem with two 12v lithium batteries in series is that there is a strong possibility the 'mid point' will get out of balance over time, there have been a number of issues reported on this forum. I'm sure it cost less than the pre-assembled ones. I built it from cells which allows me to disassemble and move them much easier. I have a 24V 280Ah Lifepo4 system in my converted campervan. Again, matching the capacity (200Ah) is advisable. To expand the 24V battery, you would add another 24V battery. With two 12V batteries, you can disconnect them from each other before moving them. You'll have to decide if moving it is feasible for your circumstance. However, a 24V battery is ~2x heavier than a single 12V battery. This is preferable if you know you're wanting a 24V system. Once you have a 24V battery, do not connect a 12V battery in parallel to it. Connecting different capacity batteries in parallel can cause undesirable effects over the lifespan of your bank. It is advisable to match the capacity of the original battery (in your case, 200Ah). To expand that, you would need to add another 24V battery in parallel. If you are allowed by the manufacturer, then yes, you can place two 12V 200Ah batteries in series to make a nominal 24V 200Ah battery. You have to make sure you are able to series connect 12V batteries. I don't want to get four 100 ah 12v batteries because I simply don't want to manage four batteries and take up that much space - unless there's a really good reason to do it that way. If I go with B and want to expand later on, do I have to add another 200 ah 24v battery? Could I add only another 100 ah 24v battery and connect it in parallel (or does it have to be another 200 ah 24v battery)? Could I make another set of two 200 ah 12v batteries connected in series and then connect the two sets in parallel? And is there any way to add another 100 ah at 12v (rather than 200 ah)? If I go with A, how do I expand the system? Any additional batteries in the series would increase the voltage past 24v. I could get A) two 200 ah 12v batteries and connect them in series, or B) one 200 ah 24v battery. I want the equivalent of 400 ah 12v batteries (or 4800 watt hours). I'm considering buying a 24v all in one inverter (probably Growatt, maybe MPP Solar) for my camper van. I'm a real beginner at this, so this is surely a kind of "stupid" question.
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