The problem nobody mentions at the point of sale
Solar panels are cheaper than they have ever been in the Philippines. Installers are busy. But most buyers find out the hard way that panels alone leave most of the bill standing.
The reason is simple. The sun gives you roughly five strong hours a day. If your home or business uses power in the morning, the evening and overnight — and almost everyone does — those hours are still bought from the grid at full price.
We wrote the honest arithmetic up in full here: why solar alone only covers around 20% of a typical bill.
What a battery changes
A battery catches the midday power you would otherwise lose or export, and gives it back when you actually need it. That does three things:
- Evenings run on your own power. The hours that used to be full-price grid hours become free ones.
- Your peak demand drops. For businesses, the demand charge is set by your single worst 15-minute spike. A battery timed to that spike shaves it directly.
- Brownouts stop hurting. The lights, tills and chillers ride through on stored power.
Why storing beats exporting: exported power is credited at the generation rate — roughly half, or less, of the retail rate you pay to import. Every unit you store and use yourself is worth about double an exported one. That is why Karnot designs for self-consumption first, not export.
The rules just moved in your favour
The new net-metering rules (circular DC2026-01-00012, April 2026) cut application decisions to 10 working days and raised the commercial cap from 100 kW to 1 MW. Approvals that used to drag for months are now quick — useful headroom if you ever do want a grid-tied system. The economics still favour using your own power first.
What Karnot fits
Karnot Energy Solutions Inc. is a Philippine energy company based in Mapandan, Pangasinan. We build heat pumps and energy storage for homes and businesses across the Philippines, the UK, the US and Canada — and our position on solar is on our homepage: we don't sell panels for a living. We sell the missing piece that makes solar work.
- iVOLT — solar + LiFePO₄ battery bundles, sized from a 3 kW starter to business systems, designed zero-export.
- iSTOR thermal batteries — store heat instead of electrons where the load is hot water; a fraction of the cost per stored kilowatt-hour.
- iHEAT heat pumps — shift your biggest thermal loads onto daytime solar. For every ₱1 of electricity in, about ₱4 of heat out.
The honest catch: a battery is the right first step only if your evening usage is real. A purely daytime operation may do better putting the money into a heat pump first. We will tell you which — that is what the survey is for.
Questions we get asked
Do I need a battery with solar in the Philippines?
If you use power in the evening or overnight, yes. Panels only generate while the sun is up — roughly five strong hours a day. Without a battery, everything outside those hours is bought from the grid at full price.
What battery type should I choose?
LiFePO₄ (lithium iron phosphate) is the sensible choice for Philippine conditions: stable in heat, long cycle life, no cobalt. It is what we fit in every iVOLT system.
What are the new net-metering rules?
Under circular DC2026-01-00012 (April 2026), applications must be decided within 10 working days, and the commercial cap rose from 100 kW to 1 MW. Exported power still earns less than power you buy, so self-consumption remains the better economics.
Is it better to export extra solar or store it?
Store it. Exported power is credited at roughly half (or less) of the retail rate you pay. A stored unit is worth about double an exported one.
How big a battery does my business need?
It depends on your evening load and your peak demand — so we measure before we quote. A free survey logs your actual usage and sizes the battery to your numbers, not a brochure's.
See what storage would do to your bill
We can install with no upfront cost: you pay monthly, less than your bill today — cash in your pocket from month one. Start with a free site survey, or run your own numbers first.
Book a free site surveyRelated reading: Solar-only vs solar + storage · Commercial solar + storage · The 15-minute rule behind your demand charge