WanderingCanuck
Well-known member
I've been spending a lot of time reading articles on batteries, charge controllers, load calculations, and all of the things in between and beyond. To put it mildly, it's a little daunting - even with electrical engineering education.
Initially I was eyeing AGM batteries, as this seemed to be the most commonly discussed battery. Then I came across LFP. Though definitely more expensive and perhaps less forgiving, there seem to be some real advantages for the system I'm considering. I can post my load calculations later if anyone is interested or if my numbers seem unlikely.
Here are some facts and figures (all values rounded up):
I understand everyone has opinions, and most are biased to what they use. If you have something that works, or components that would fit into what I've described so far I'd appreciate an accurate account of your setup and experience. But please don't use this thread to start a debate over what's the "best".
Thanks in advance for your time and knowledge.
Initially I was eyeing AGM batteries, as this seemed to be the most commonly discussed battery. Then I came across LFP. Though definitely more expensive and perhaps less forgiving, there seem to be some real advantages for the system I'm considering. I can post my load calculations later if anyone is interested or if my numbers seem unlikely.
Here are some facts and figures (all values rounded up):
- 100 Ah @ 12V daily use, includes 20% buffer above calculated loads (35% discharge AGM = 285Ah, 70% discharge LFP = 150Ah)
- Vehicle alternator charging only, ideally with less than 2h of driving per day. Some of this could be parked with higher idle if it makes sense.
- From my reading so far, it seems programmable DC-DC charge controller is the way to go and I'm not looking to start a debate on that, but welcome opinions that are helpful.
- 1500W - 2000W inverter for occasional use of hand blender (700W), Microwave (1000W), Kettle (1200W) - These are figured into the initial 100Ah figure
- I'm still deciding between an induction cooktop and propane, induction bringing my power requirements to 140Ah daily (AGM = 400Ah, LFP = 200Ah)
- Induction simplifies cooking - maybe?, but I'd have propane anyway for a furnace. I'm beginning to talk myself out of induction.
- I'd be happy to add a second (or third?) high output alternator if that makes the most sense. Where does the law of diminishing returns kick in here?
- I shy away from solar due to being at 44.5° N and in an area with plenty of clouds and snow fall in the winter. Not to mention not wanting to draw attention to the vehicle.
- Products easily available in Canada or shipped to Canada are preferred. (This rules out much from Amazon.com)
- Cost is a factor, but reliability and very low maintenance are paramount.
- If possible, I'd like to keep batteries inside the always-heated living space without venting. Is this acceptable (and safe) with LFP? With AGM it seems they need to be vented, which means it is harder to keep them warm in the winter. How is over-temperature in the summer dealt with? Are ceiling vents enough if outside temperature reaches 40°C (104°F)?
I understand everyone has opinions, and most are biased to what they use. If you have something that works, or components that would fit into what I've described so far I'd appreciate an accurate account of your setup and experience. But please don't use this thread to start a debate over what's the "best".
Thanks in advance for your time and knowledge.