OldSmokey
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Re: Review/critique of planned battery/inverter system?
ependydad wrote: Ok, I've revised the diagram with a couple of updates: I noticed my charger was bypassing the battery disconnect and worse was also bypassing the shunt so it wouldn't be counted. I tried to add clarity to the 15amp transfer switches I tried moving the charging points so they would more equally balance the batteries Click for full-size 1. battery disconnect is in the preferred place, if you place it in the positive line the battery positive terminals are still hot and a wrench from a terminal to chassis will result in fireworks. the automotive industry worked this out a long time ago which is why they tell you to disconnect the negative side first. 2. there should be a strap from the shunt to chassis at one point only, either at the shunt or the negative buss bar as drawn or at the campers distribution panel. one and one only. 3. power takeoff. as you are using lithium drop-ins, you will not have the issues lead acid suffer from in parallel. as drawn the positive take off should be on the bottom battery terminal and the negative should be on the top battery terminal. 4. fuse to the inverter is on the small size. inverters are at best 90% efficient so at full load you will have approx ( 1000 * 1.1 ) / 12 = 91.6 Amps.. your 80 A breaker will most likely trip. 5. there is no fuse in the converter positive line, hopefully there is one inside the converter itself.754Views0likes0CommentsRe: Solar Rule Of Thumb....
time2roll wrote: OldSmokey wrote: without his daily w/hr it's all guesswork. So the OP should install a battery monitor for $200 and camp a few times to get some real data? I would just put the $200 toward 200 watts of solar and not worry so much. do you have a monitor ? i bet u do.. any solar system should have a monitor... it doesn't take much to establish a good estimate of usage and then design from there.. jeez.. here i am able to offer professional advice and you guys are poo pooing it in favor of internet researched rules of thumb.. srsly ?609Views0likes0CommentsRe: Solar Rule Of Thumb....
scrubjaysnest wrote: HikeN2Mts wrote: One rule of thumb 100 watts solar for every 100 amp hours of battery. It really depends on your usage, you need to calculate the watts of each item you will be using for total watts/amp hours used and what is needed to put back into batteries. While the above is the universal rule of thumb; we find in practice 140 watts per 100 aH is a better choice. please don't post arbitrary nonsense like this, all it will do is result in frustration and failure for those that adopt it. My partners and I just shook our heads this morning.. let me give you an example of why there is no rule of thumb that will work. my rv has 960 watts of solar.. so how many a/h do i have ? can u guess ? no, there is insufficient data. whats missing ?.. well two things. 1) Voltage 2) Autonomy change any one of those two and your thumb is blown away. i do, in fact have a 300 a/h 48 Volt bank of prizmatics that new thumb ratio for you is now 3.2:1. i dont wish to sound arrogant, but do you understand now why a 1:1 rule is just bull ? doing it right is very simple, no thumbs required!609Views0likes0CommentsRe: Solar Rule Of Thumb....
time2roll wrote: The OP has already decided he needs 4x Group 24 battery. I would assume he uses 30% to 60% daily. How you gonna charge that back up? The good news is that solar is low cost and silent. read the op's post again.. he owns 4 batteries, he does not state he needs 4 batteries. if he did then presumably he would know his daily watt/hr requirements and i'm sure he does not.. without his daily w/hr it's all guesswork.610Views0likes0CommentsRe: Solar Rule Of Thumb....
full_mosey wrote: OldSmokey wrote: As a professional I will state there are no rules of thumb for solar design, only good design and bad diy design. if you would like to pm me with your requirements and expectations i will gladly assist you in a correct design. Could you give an example or two to illustrate how widely a design can vary from the 1:1 rule-of-thumb? HTH; John I can see the humor in that reply.. :B364Views0likes0CommentsRe: Solar Rule Of Thumb....
1L243 wrote: I was wondering with so many variables is there a rule of thumb on how large of a solar system you need to keep your batteries charged so not having to run the generator. The factors I would include is my trailer has LED lighting and a 40" TV. The TV may be used two or three hours a day... I have four group 24 12 volt batteries.. Thanks for any input As a professional I will state there are no rules of thumb for solar design, only good design and bad diy design. if you would like to pm me with your requirements and expectations i will gladly assist you in a correct design.363Views0likes0Comments
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