Those two panels have to be wired in parallel if you have a PWM charge controller, but could be wired in series if using a MPPT controller. The advantage of higher voltage serial panel connections is less power loss due to voltage drop, and thinner copper wire, which will be cheaper.
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This... is learning right here. I've never heard of PWM being useful only in parallel, but I guess it makes sense. Thank you! I guess if you're crazy and have some "6v" panels (I'm talking those garden light or maybe IP camera or powered gate type panels), maybe series connection would make sense, because you need the PV supply to be above the battery charge voltage. But bringing that voltage up too high could be dangerous for the battery, and so parallel makes sense for panels which are individually already at that voltage level.
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As general rule of thumb, you only want to pull as much power out of a battery as the charging limit, so in the above case of a 100Ah battery, you don't want to pull out more than (100Ah/8) X 12V = 150W. If you want to power larger items, you need a larger battery. If you want a larger battery you need more watts of panels.
Hope that is helpful for you.
I'm currently renting, and no room for a shed in the back yard, so for now it's just tinkering. The long term goal will be build my own house, with planned hybrid solar setup (so consideration for roof alignment, and sizing etc to allow for optimal North facing panel installation with plenty of room for panels, allowance for installation of the storage and chargers/inverters in a sensible place, 3-phase supply to the house, a dedicated EV charging circuit, for the inevitable future etc).
I know it's insane right now, but I'd like to get something like a 40kWh LTO battery system. Now, sizing of the panels for such a setup, is something I hope to learn over time. The idea of reducing the costs for maintaining (ie replacing the cells after their lifetime cycling is reached) is appealing. 20,000 - 30,000 cycles lifetime must have some huge possible savings when amortised over the lifetime of the cells. 55 years? Yes please! Something like a 30s16p using 35ah LTO cells for a 72v storage system.
I'm also planning to get an actual workshop sized shed built with the house. Tired of having no space and shuffling cars in and out of the garage to be able to work on projects. One thing I have imagined (not seen any videos on the idea yet) is to have the storage located in that workshop, away from the house, for possible safety benefits. I don't know if that makes sense, but it's rattling around in my head as something to look into. I'd hope to have a large panel install on the house, and supplemental panels on the workshop roof. Maybe all one big homogeneous system, or perhaps 2 discrete systems. I don't know. Maybe it would be beneficial to have a hybrid system in the workshop, to be able to cope with the lack of generation in winter (we're talking Aussie winter here, getting down to maybe 1C and very cloudy/rainy for months on end in Perth, and this will be part of my learning curve. How much does winter affect generation.)
Anyway, that's the plan. Gots to keep this big brain occupied, and why not find a way to drop our ever increase costs from relying on "state operated" power supply, and combustable fuels for our transport. Not really interested in supplying the grid, as FITs here are abysmal. Maybe that will change and fluctuate, with the possibility of traditional generation facilities going offline over time, but for now, I'd love to just use solar to power the house and future EVs completely, especially in the event of power outages due to scheduled utilities work, or some sort of "natural" disaster. (Imagine having a non-usable vehicle, or losing all your perishable foods, not being able to do basic human stuff because some clown decides to break the utility supply for days on end, or a wild fire takes out your local substation). We could even consider going for electric hot water and cook top (yecchhh!! We have gas water heating and stove top here) and ditch that ongoing cost also.