How solar installers build recurring revenue from systems they've already installed

Solar installation is a project business. You win a customer, you install a system, you get paid once, and then you go and find another customer. When installations slow down, revenue slows with them immediately, because nothing carries over from the work already done.

Meanwhile every company has an install base: hundreds or thousands of systems that are still on roofs, still producing, still owned by people who once chose you. That base is the only asset in the business that does not need to be won again. Almost nobody monetises it.

The mechanism is a care plan — a monthly subscription covering monitoring, fault alerts and a periodic performance report on a system already installed. US installers commonly price these between $15 and $25 a month. The cost side is the monitoring platform; we charge $1.50 per system per month.

The arithmetic is simple. Four hundred systems at $20 a month is $96,000 a year of care-plan revenue, against $7,200 a year of monitoring cost. The install base is already paid for. Those trucks rolled years ago. The spread is margin on work already done, and the whole case survives being written on a napkin, which is the test that matters.

The honest part is what that number assumes. It assumes every system on the plan. Nobody converts an entire install base, and any vendor calculator that quietly applies an adoption rate you cannot see is hiding the only variable that matters. Model it yourself: decide how many of your customers you realistically expect to convert, and run the arithmetic on that number rather than your total.

Selling the plan is easier when there is something to point at. "We will watch your system" is an abstract promise. "We watch your system against what it should be producing, and here is the month we caught a dead string that was costing you $260" is a concrete one. Care plans sell on demonstrated catches, which means the monitoring has to actually find things before the sales pitch works.

There is a second reason to build this now that has nothing to do with margin. A service relationship is a reason to stay in contact with a customer who otherwise disappears the day the system is commissioned. Referrals, battery retrofits, panel additions, roof replacements: all of them come from customers you are still talking to. A monthly report is a standing conversation.

The failure mode to avoid is selling a plan and then not delivering the watching. A care plan that produces nothing but a monthly charge is worse than no plan. It turns a satisfied customer into a resentful one. If you are charging for monitoring, someone has to act when the monitoring finds something.