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Need help choosing parts
#1
I've been following HB Powerwall and jehugarcia on YT for a while now and decided to build my own 18650 power storage. Right now I have around 170 cells (more to come soon) and a Batrium WatchMonPlus. I'm still looking for a solar charger and inverter. It will only need to be small as it will only run a computer and maybe the internet. The problem is I can't seem to find any good equipment available in Australia for it. can someone direct me to what I should look at?
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#2
First of all you need a couple of thousand cells. I highly recommend you collect that first before you start to buy anything. Then you look into what exactly you intend to do.

We see people every day that buy stuff first and then figure out what they want to do Smile

I normal PIP 5048 is a good generic solar charger and inverter all in one unit.
OffGridInTheCity likes this post
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#3
I'm just looking to get a 1000w inverter that I can run 24/7.
Load will be 500w or less. Would like to add PV to it at some point but I'll probably start with mains connected if possible.
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#4
(06-27-2020, 09:25 PM)J05H912 Wrote: I'm just looking to get a 1000w inverter that I can run 24/7.
Load will be 500w or less. Would like to add PV to it at some point but I'll probably start with mains connected if possible.
500w/hour * 24hrs = 12kwh/day.   Let's say you have solar 1/2 the day (enough to power the inverter AND charge the battery)...  that still leaves 'on the order of' 6kwh the rest of the day.   A battery pack that can deliver 6kwh/day (with 50-60% DOD) would be 'on the order of' 14s100p (or 7s200p) - e.g. 1,400 cells.
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#5
Would this charger be ok for a 14s system?
I was reading through the manual and it says bulk charge is 56-59v which is above the 58.8v (14x4.2v) that is the max for my batteries.
It also says "the unit just can use 12V/24V36V/48V Lead-Acid and can't for other specifications of the battery now."
https://www.jaycar.com.au/50-amp-mppt-so...r/p/MP3731
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#6
12kwh per Day results in atleast 15kwh energy from.battery. then add upp losses going from ac you need another couple of kwh

So all in all.... Doing
Ac -> battery > ac has alot of losses.
So what is your goal? Massive online Ups? Because baovr scenario cost you atleast 16-17kwh per Day to Power 12kwh load including the Gear.

As i often say and it may sound negative but many People start in the wrong way. IF your plan is to save some bucks you start with solar with grid tie or solar with battery. Powering thing from battery charged from ac.... Nah not worth it in many places Smile
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#7
My current plan is to get it up and running through mains and switch to solar or add more panels after it is up and running. I have a low income at the moment, so I can I only get $300-400 worth each fortnight. Right now I just want to get the charger and have an idea of what inverter I can use once I have the money. Once I have those I can add 640 or so cells per fortnight.
So would that mppt charger work for a 14s battery configuration?
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#8
It would but i Still recomend buy a proper one that do solar like the pip. Because i still think you start in wrong end. IF you dont have more money to spend you Will in the beginning end Up wasting money in terms of electricity due to starting in wrong end.

Solar should be the first end and not to run it via ac....
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#9
(06-28-2020, 11:15 AM)daromer Wrote: It would but i Still recomend buy a proper one that do solar like the pip.

Sorry I'm a bit confused now. Are you saying that the unit I linked cannot do solar?
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#10
That One do it. But i intepretaded that you are going to run your load via ac as Charger as start? .IF your plan is solar as start then om happy again Wink
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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