Solar advice please

Papa Smurf

Honorary Master
Joined
Aug 2, 2016
Messages
22,196
Like I said this is overkill and hellava expensive for this application..
You don't need an inverter!
true true
but then the addiction starts
people add more stuff
cellphones
tv's
dstv
lights
etc etc
hahhaaa, future proof is number 1 :thumbsup:
 

PUP Backup

Well-Known Member
Joined
Jan 30, 2019
Messages
147
Let's look at the costs: The man had a 6 day outage. Backup for that is an off grid solar installation so lets look at backup for a day:

Option 1:
Inverter R5000
2 100Ah batteries @ R2000 = R4000
Total: R 9000
Assume 8 hours backup if not powering TVs, hair driers etc.

Option 2:
Low voltage UPS R500
1 7Ah battery R250
Spare battery for laptop R600
Total: R 1250
Backup time 8 hours
 

Papa Smurf

Honorary Master
Joined
Aug 2, 2016
Messages
22,196
Let's look at the costs: The man had a 6 day outage. Backup for that is an off grid solar installation so lets look at backup for a day:

Option 1:
Inverter R5000
2 100Ah batteries @ R2000 = R4000
Total: R 9000
Assume 8 hours backup if not powering TVs, hair driers etc.

Option 2:
Low voltage UPS R500
1 7Ah battery R250
Spare battery for laptop R600
Total: R 1250
Backup time 8 hours
you forgot to add solar panels
now OP has power ALL day for laptop and router and a few hrs at night :thumbsup: OP wasnt asking for the cheapest solution
 

Steamy Tom

Executive Member
Joined
Jan 23, 2019
Messages
6,011
Let's look at the costs: The man had a 6 day outage. Backup for that is an off grid solar installation so lets look at backup for a day:

Option 1:
Inverter R5000
2 100Ah batteries @ R2000 = R4000
Total: R 9000
Assume 8 hours backup if not powering TVs, hair driers etc.

Option 2:
Low voltage UPS R500
1 7Ah battery R250
Spare battery for laptop R600
Total: R 1250
Backup time 8 hours
p1$$ off trying to peddle your kak products here
 

Sinbad

Honorary Master
Joined
Jun 5, 2006
Messages
71,517
any specific reason you added the external charge controller?
What, the MPPT?
This Victron doesn't have a charger built in, panels output 200V, battery won't love that (and nor will the inverter actually)
 

Steamy Tom

Executive Member
Joined
Jan 23, 2019
Messages
6,011
What, the MPPT?
This Victron doesn't have a charger built in, panels output 200V, battery won't love that (and nor will the inverter actually)
lol fair enough i wasn't aware that model didn't have a built in controller
 

PUP Backup

Well-Known Member
Joined
Jan 30, 2019
Messages
147
If you just want backup, why bother with solar?
There's a perception that 'solar' is the answer to all electricity supply issues and that it replaces grid power painlessly. This is not the case, hence the variations: e.g. backup power, off grid and grid tied systems.
Independence from intermittent grid supply is one thing but installing an off grid system is another thing altogether.
So when someone posts a thread like this one you need to understand where they're coming from...
 

Pho3nix

The Legend
Joined
Jul 31, 2009
Messages
28,090
Sorry to hijack the thread. Looking to start migrating some plugs onto solar. Plug usage for the lounge is this :



What kinda system would be needed to carry this?
 

Steamy Tom

Executive Member
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Jan 23, 2019
Messages
6,011
Sorry to hijack the thread. Looking to start migrating some plugs onto solar. Plug usage for the lounge is this :



What kinda system would be needed to carry this?
It looks like the usage there is probably around 2kwh average a day, but over how many hours. Because if you are drawing up to 2.6kwh at a time you need at least a 3kw inverter, but if it is say 500w over 5 hours then you could get away with much smaller. It is much better though to plan for a bigger system up front.
 

Pho3nix

The Legend
Joined
Jul 31, 2009
Messages
28,090
It looks like the usage there is probably around 2kwh average a day, but over how many hours. Because if you are drawing up to 2.6kwh at a time you need at least a 3kw inverter, but if it is say 500w over 5 hours then you could get away with much smaller. It is much better though to plan for a bigger system up front.
This is over the whole day. So a system for 5 kWh for lights and TV+Internet would work?
 

Steamy Tom

Executive Member
Joined
Jan 23, 2019
Messages
6,011
This is over the whole day. So a system for 5 kWh for lights and TV+Internet would work?
my whole place excluding the stove and the geyser runs on a 5Kw inverter, but yes obviously if i start up the dishwasher, microwave, washing machine all together i will trip it.

but yes a 5Kw will definitely do it.
 
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