Good decisions come from experience. Experience comes from making bad decisions. Mark Twain
The best place to pray for a good crop is at the end of a hoe!
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
ReCycle.. Ride your bike again.
Tony Masterson wrote:Two batteries in series are charging.
Battery A is 99% full.
Battery B is 40% full because it has a load attached to it.
It's my understanding (nearly) empty batteries are charged at high amps and as they fill the amps go down.
Does that mean Battery-A sets the max amps at say 1A, while Battery-B can safely handle 10A.
Tony Masterson wrote:Additional question.
If I have a 100 Ah battery how much will be available for actual use? Not just talking about conversion losses of all sort, but also how much the battery can be discharged without dramatically shortening its lifespan?
Is there a rule of thumb that states "Don't discharge a battery below x%"?
ReCycle.. Ride your bike again.
Eugene Kenny wrote:
Tony Masterson wrote:Two batteries in series are charging.
Battery A is 99% full.
Battery B is 40% full because it has a load attached to it.
It's my understanding (nearly) empty batteries are charged at high amps and as they fill the amps go down.
Does that mean Battery-A sets the max amps at say 1A, while Battery-B can safely handle 10A.
Not recommended to load a single battery of a bank. SERIES connected batteries act independently and both batteries in a bank should be maintained at close to same DOD Voltages... and likewise, charged as if a single 24v battery (i.e. two 12V batteries in series = 24V (charged @ approx. 27-28V). If you wish to load a single 12V battery, then you'll need a 12V charger.
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
The best place to pray for a good crop is at the end of a hoe!
Some places need to be wild
Tony Masterson wrote:I'm learning a lot here... !
I got some solid advice on my first post. Building on that advise my next question about connecting loads and efficiency.
If I have a single 12v battery what would the best choice for stuff I power with it?
Let's assume I want to buy a 70watt rice cooker that comes in a 12v, 24v and 110v versions.
Which one would be the best option efficiency wise?
Personally I would say 12v because I can directly connect that to the battery. That would be 100% efficiency opposed to using a convertor which usually has only 80% efficiency.
Correct?
Or is directly connecting to the battery not advised?
That said the benefit of powering at 110v is clear. There is far more choice of 110v equipment than 12v.
If I would go for 110v output would a higher input voltage (24, 36) would that increase efficiency?
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
Some places need to be wild
Some places need to be wild
Tony Masterson wrote:Is stuff like this ok?
https://www.aliexpress.com/item/4000473412279.html
https://www.aliexpress.com/item/32626848534.html
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
Tony Masterson wrote:Panel specs:
150W at an irradiance of 1000w/m2 (doubles at double irradiance?)
The cell efficiency is 19.5%.
Area: 0.63 m2
https://globalsolaratlas.info/map
Today at my location: Direct normal irradiation: 2.469 kWh/m2 per day
I need help how to calculate the daily harvest in kWh.
2.469 x 0.195 x 0.63 = 0.3 kWh/day ???
'Theoretically this level of creeping Orwellian dynamics should ramp up our awareness, but what happens instead is that each alert becomes less and less effective because we're incredibly stupid.' - Jerry Holkins
Tony Masterson wrote:Several times it was asked, what the loads are, what I'm using it for etc.
I'm not intending powering a whole house with it. So my solar setup won't be connected to the wiring in my house.
It's purely an emergency thing. That means it may take years before I first use the setup (aside from a test run)
ReCycle.. Ride your bike again.
Some places need to be wild
Eric Hanson wrote:Michael,
That looks like a pretty nice 1Kw solar setup. I am just curious, what does your battery setup look like? Are they 12 volt batteries wired in series? What kind of amp hours are you getting. I am playing around with the idea of making a backup system, but nothing like what you are describing. Basically I am just looking for ideas.
Some places need to be wild
Eric Hanson wrote:
These are some impressive battery figures. This is a lot better figures than my plans call for so I am definitely impressed/intrigued.
What type of battery chemistry are you using? It does not seem like lead-acid or lithium-ion. I am not certain what type of cell can give you 4 volts so I am definitely interested.
Tony Masterson wrote:Related question...
What's the practical capacity of a 100Ah, 12v deep cycle battery?
Hopefully I'm overly pessimistic but I think only 20% or 20Ah.
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